Collapsible stroller frame



FIG. 1 is a front perspective view of the collapsible stroller frame showing our design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof, the opposite side view being a mirror image;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a collapsible stroller frame, as shown and described. 